[Maico]

If money is an issue, afracier is right. You can get a lot more free stuff. However, I have bought Wings over Jungles/Waves and Citadel. The amount of skins I got was well worth the price of admision. The missions are awesome. The stuff is really quality. Battle over Europe was and is not really good, at all. I cant offer an opinion on Rebirth of Honor as I dont have it. The Fires Above and Ostfront are excellent. I really dont feel that IL2 is complete without these. When I build missions I use a lot of the skins that come with these. Makes things a lot easier.
There is something really cool about these. You get everything in one package and its installed in minutes. You get LOTS of skins and more mission than you can fly.